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WoW:Getting started with writing AddOns (source)
Revision as of 19:18, 10 August 2022
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Beware Lua functions and variables are globals by default and are directly visible to the other addons. If authors blindly use simple and common names, like: | Beware Lua functions and variables are globals by default and are directly visible to the other addons. If authors blindly use simple and common names, like: | ||
<pre> | <pre> | ||
addonEnabled = true; | |||
function GetArrowsCount() | |||
... | ... | ||
end | |||
</pre> | </pre> | ||
An addon will easily conflict with variables of the same name from other addons or from the Blizzard interface. Instead, you should write your addon more like a Lua module: place all the data and functions in a single global table, named after the addon, and use local declarations otherwise (no other globals), like: | An addon will easily conflict with variables of the same name from other addons or from the Blizzard interface. Instead, you should write your addon more like a Lua module: place all the data and functions in a single global table, named after the addon, and use local declarations otherwise (no other globals), like: | ||
<pre> | <pre> | ||
MarksmanAddOn = { }; -- about the only global name in the addon | |||
local addonEnabled = true; -- local names are all ok | |||
function MarksmanAddOn:GetArrowsCount() | |||
v... -- function is now inside the global table | |||
end | |||
MarksmanAddOn.arrowsCount = MarksmanAddOn:GetArrowsCount() | |||
</pre> | </pre> | ||
For large add-ons this can get complicated, and the current version of Lua doesn't offer much to help. Use a full, clear, name for the global table, and assign a shorter name in your .lua files, like: | For large add-ons this can get complicated, and the current version of Lua doesn't offer much to help. Use a full, clear, name for the global table, and assign a shorter name in your .lua files, like: | ||
<pre> | <pre> | ||
local mod = MarksmanAddOn; | |||
-- then you can write | |||
mod.arrowsCount = mod:GetArrowsCount() | |||
</pre> | </pre> | ||